Radial drill.



No. 676 I97.` Patented lune Il, |90l.

A. MILL. `Mmm. bnlLL.

. (Application med oct. 26, 1900.) Y (Nufllodel.) Y 2 Sheets-Sheet l` uuenl'oz @virmw i @M No. s76,|97. Patented :une n, Isdn- A. MILL.

RADIAL MILL. (Application led Oct. 28. 1900.)

2 Sheets-Shet 2,

(N0 Model.)

@fiez n c lia UNITED STATES PATENT VOEEroE.

ANTON MILL, OF CINCINNATI, OHIO, ASSIGNOR TOTHE AMEURICAN TOOL WORKS COMPANY, OFV SAME PLACE.

RADIAL DRILL.

SPECIFICATION forming part of Letters Patent No. 676,197, dated June 11, 190i.

I Application led October 26, 1900. Serial No. 34,500. (No model-.l

To all whom it may/concern:

Be it known that I, ANTON MILL, a citizen of the United States, residing at Cincinnati, in the county of Hamilton andState of Ohio, have invented certain new and useful Improvements in Radial Drills, of which the following is a speciiication.

The object of my invention is to provide a speed-changing device for a radial drill employing a swiveling arm interposed between the transmitting-shaft on the main column and the driving-gear on lthe radial arm,whereby a variable speed may be obtained to drive the radial-arm shaft in the various positions it may occupy.

Other features of my invention will be more fully set forth in the description of the accompanying drawings, forming a part of this speciiication, in which- Figure lis a side view of my improved drill. Fig. 2 is a section on line so Fig. 1, with the drill-head removed. Fig. 3 is a section on line y y, Fig. 1. Fig. 4 is a section on line w w, Fig. 2. Fig. 5 is a sectional View on line o o, Fig. 3, of the shifting levers and the reversible gears mounted upon an eccentric. Fig. 6 is a plan View showing the arrangement of shafts of a variable-speed gear shown in Fig. 3.

A represents the base or bed plate of the machine; A', a cone of driving-pulleys on shaftl A2; A3, a bevel-gear on said shaft for transmitting motion to a bevel-gear A4 on the vertical shaft A5, preferably j ournaled centrally within the main column A6.

B represents the base of the column; A7,

the clampingyoke forming the lower journalbearing for the tubular column on which the radial-drill arm is journaled.

a represents the journaled sleeve on which is supported the radial arm.

b represents the radial arm proper, swiveled upon the sleeve-arm ct and clamped thereto by means of the ring b.

C represents a train of gears for transmit-- ting power from the central vertical shaft to the driving-shaft E, and C represents a train of gears for transmitting power to the screwshaft D, which raises and lowers the radialdrill arm. These parts are preferably constructed in the manner shown in my previous application, filed October 20, 1900, Serial No. 33,694; but any form of 'transmittinggears maybe employed in lieu thereof.

In the accompanying drawings, G G' represent reversing bevelfgears mounted upon shaft E.

R represents a right and left hand clutch member operated by the shifting lever R to clutch either of the gears G and G' to the driving-shaft for the purpose of reversing the Inotion. The features in this clutch of reversing mechanism are not claimed herein, being claimed in my said prior application.

It is desirable in radial drills to employ speed-changing gears, so as to vary the motion of the drill-spindle, and it is also desirable to have speed-changing devices interposed between the driving-shaft journaled on the column of the drill and the shaft on the radial arm so that the operator can ch'ange the speed by regularly shifting the levers mountedupon the radial arm, and it is also desirable to arrange these speed changers so that the speed may be changed while the drill is in operation. I accomplish t-hese results in the following manner: F represents a studshaft carrying a bevel-gear G2, which engages with either the left or right hand bevel-gears G G, mounted on the driving-shaft E. Upon stud-shaft F are mounted two gears-1, a gear in the rear of bevel-gear G2, and 2 a smaller transmitting-gear on the outer end of said shaft-and these two gears are alternate transmitters for conveying power to the radial arm on shaft L. Upon radial-arm shaft L are likewise mounted gear 3 and gear 4. 4

In order to obtain the fast speed, I provide two sets of shifting transmitting-gears, as follows: J represents a tumbler-shaft journaled in the head of the radial arm b. Said tumblershaft J carries gears 5 and G. When said tumbler-shaftis turned in one direction, gear 5 is brought into mesh with gears l andA 3, which transmit fast speed to the shaft L. When the tumbler-shaft is turned to the extreme opposite direction, it brings gear 6 into mesh with gears 2 and 4, and thereby transmits a slower mot-ion with increased power to said shaft L.

For convenience of operation a shipping-le- IOO ver lll is shown as clamped upon the stud'- shaft 3 of gear 6,. It is provided with a hinge- Joint m and a lng '7, adapted to engage in notches 8, 9, and of the segment-plate 11,

so that when said shipping-lever is engaged in the center notch 9 radial-arm shaft L is idle; but when the lever is shifted to the right or left it can be locked in position to obtain either fast or slow speed, as desired, and thereby increase or decrease the power employed.

R represents a shipping-lever journaled upon the sleeve which supports the radial arm and connected to the reversing shaft which operates right and left hand clutch for reversing the motion to the shaft 'L of the radial'arrn, and thereby the drill-spindle. It

will be observed that the-shipping-lever M for changing the speed is mounted upon the swiveling radial arm and both are in convenient reach of the operator, so that he may reverse the motion which is required in tapping and may readily change the speed from fast to slow, or vice versa, as the case requires. It will also be observed that by throwing either of these two levers into central or neutral. position the revolution of the drill-spindle is stopped. `I believe I am the first to accomplish this result by shipping-levers mounted on said lever and adapted to be alternately intermeshed with the oppositely'r-V arranged driving and driven gear-wheels when the lever is turned, substantially as specified.

2. In a radial drill, a driving and a driven shaft arranged parallel, a pair of driving gear-wheels on the driving-shaft, a pair of driven gear-wheels on the driven shaft, two of said gear-wheels being of dierent diameter, the driving gear-wheels being placed respectively opposite to the driven gear-wheels, a lever, a pair of transmitting gear-wheels eccentrically j ournaled on said lever adapted to be alternately intermeshed with the oppositely arranged driving and driven gearwheels when the lever is turned to extreme opposite positions, and to be disengaged from both when the lever is in neutral position,

. substantially as specified.-

3. In a radial drill, a driving and a driven shaft arranged parallel, a. pair of driving gearwheels on the driving-shaft, a pair of driven gear-wheels respectively placed opposite on the driven shaft, twol of said geawwheels being of different diameter, a lever, a pair oi' transmitting gear-wheels eceentrieally journaled on said lever and adapted t0 be alternately intermeshed with said oppositely; plaeeddriving and driven gear-wheels respec tively, and means for locking said lever in either position of engagement or in position ef disengagement, substantially of specified.

In testimony whereof I have hereunto set my hand.

ANTON MILL. \Vitnesses:

OLIVERy B. KAISER, EMMA MILL.. 

